XCEngine/engine/src/RHI/OpenGL/OpenGLSwapChain.cpp

#define GLFW_INCLUDE_NONE
#include "XCEngine/RHI/OpenGL/OpenGLSwapChain.h"
#include <GLFW/glfw3.h>
#include <glad/glad.h>

namespace XCEngine {
namespace RHI {

static int ToGLFWPresentMode(PresentMode mode) {
    switch (mode) {
        case PresentMode::Immediate: return 0;
        case PresentMode::VSync: return 1;
        case PresentMode::Mailbox: return -1;
        case PresentMode::Fifo: return 1;
        default: return 1;
    }
}

OpenGLSwapChain::OpenGLSwapChain() 
    : m_window(nullptr)
    , m_width(0)
    , m_height(0)
    , m_framebufferWidth(0)
    , m_framebufferHeight(0)
    , m_vsync(true)
    , m_presentMode(PresentMode::VSync) {
}

OpenGLSwapChain::~OpenGLSwapChain() {
    Shutdown();
}

bool OpenGLSwapChain::Initialize(GLFWwindow* window, bool vsync) {
    m_window = window;
    m_vsync = vsync;
    m_presentMode = vsync ? PresentMode::VSync : PresentMode::Immediate;

    int w, h;
    glfwGetFramebufferSize(window, &w, &h);
    m_framebufferWidth = w;
    m_framebufferHeight = h;

    glfwGetWindowSize(window, &w, &h);
    m_width = w;
    m_height = h;

    glfwSwapInterval(m_vsync ? 1 : 0);

    return true;
}

bool OpenGLSwapChain::Initialize(GLFWwindow* window, int width, int height, PresentMode mode) {
    m_window = window;
    m_width = width;
    m_height = height;
    m_presentMode = mode;
    m_vsync = (mode == PresentMode::VSync || mode == PresentMode::Fifo);

    glfwSetWindowSize(window, width, height);

    int w, h;
    glfwGetFramebufferSize(window, &w, &h);
    m_framebufferWidth = w;
    m_framebufferHeight = h;

    glfwSwapInterval(m_vsync ? 1 : 0);

    return true;
}

void OpenGLSwapChain::Shutdown() {
    m_window = nullptr;
}

void OpenGLSwapChain::Present() {
    if (m_window) {
        glfwSwapBuffers(m_window);
    }
}

void OpenGLSwapChain::SwapBuffers() {
    if (m_window) {
        glfwSwapBuffers(m_window);
    }
}

void OpenGLSwapChain::Resize(int width, int height) {
    m_width = width;
    m_height = height;
    if (m_window) {
        glfwSetWindowSize(m_window, width, height);
    }
}

void OpenGLSwapChain::SetVSync(bool enabled) {
    m_vsync = enabled;
    glfwSwapInterval(enabled ? 1 : 0);
}

void OpenGLSwapChain::SetFramebufferSize(int width, int height) {
    m_framebufferWidth = width;
    m_framebufferHeight = height;
}

bool OpenGLSwapChain::ShouldClose() const {
    return m_window && glfwWindowShouldClose(m_window);
}

void OpenGLSwapChain::SetShouldClose(bool shouldClose) {
    if (m_window) {
        glfwSetWindowShouldClose(m_window, shouldClose ? GLFW_TRUE : GLFW_FALSE);
    }
}

void OpenGLSwapChain::PollEvents() {
    glfwPollEvents();
}

} // namespace RHI
} // namespace XCEngine